The Effect of Ettringite-Generating Origin on the Expansion Characteristics of Mortar Specimens during Water Immersion Test

Abstract

This study was conducted to investigate the expansion characteristics of mortar specimens during water immersion test, considering "Ettringite (Ett)-generating origin" in cement paste specimens. Specifically, the expansion characteristics of mortar specimens were estimated, suggesting Ett production for each constituent mineral estimated by XRD-Rietveld and selected dissolution methods as an indicator. Results shows that the expansion characteristics of mortar specimens could require not only simple Ett production change evaluation before and after water immersion, but also the evaluation, considering the generation cite of Ettringite and coexisting materials such as C-S-H around Ettringite.